For a highway bridge over a railroad, the governing regulation is Â§646.214(a)(2), The State transportation agency should follow its normal specifications, design standards, and guidelines for Federal-aid highway projects.
Pregnancy in dogs typically lasts 63 days (about nine weeks). The duration of a dog's pregnancy can fall in the range of 58 to 68 days.Though estrus (heat cycles) can vary from breed to breed, the normal gestation period falls within the same range for all dogs, regardless of breed.1  Most dogs will show no signs of pregnancy in the first several weeks.ow Long is a Dog's Pregnancy? Pregnancy in dogs typically lasts 63 days (about nine weeks). The duration of a dog's pregnancy can fall in the range of 58 to 68 days. Though estrus (heat cycles) can vary from breed to breed, the normal gestation period falls within the same range for all dogs, regardless of breed.
Stages and Dog Pregnancy Timeline. Month 1: Dog Fetus: Days 1 through 4: Pregnancy starts when the dog ovulates, which is called the data of whelping. Dog sperm will reach an ovum on day 4 (48 to 73 hours). Day 7: Embryos will move to the uterine horns. Day 16: Dog embryos embed in the uterus lining.